Media Capture Depth Stream Extensions API: focal length and depth range.

media/capture/video/video_capture_device_descriptor.h

Index: media/capture/video/video_capture_device_descriptor.h
diff --git a/media/capture/video/video_capture_device_descriptor.h b/media/capture/video/video_capture_device_descriptor.h
index b7e7819cfdd7d55c0c4ad8b8e7a60b6c653a6081..28ec8a283a0a845594717599685d06c0516a07cb 100644
--- a/media/capture/video/video_capture_device_descriptor.h
+++ b/media/capture/video/video_capture_device_descriptor.h
@@ -8,6 +8,7 @@
 #include <string>
 #include <vector>
 
+#include "base/optional.h"
 #include "media/base/video_facing.h"
 #include "media/capture/capture_export.h"
 
@@ -83,6 +84,21 @@ struct CAPTURE_EXPORT VideoCaptureDeviceDescriptor {
 
   VideoCaptureApi capture_api;
   VideoCaptureTransportType transport_type;
+
+  // Contains camera calibration parameters.
+  // These parameters apply to both RGB and depth video devices.  See also
+  // https://w3c.github.io/mediacapture-depth/#mediatracksettings-dictionary
+  // TODO(aleksandar.stojiljkovic): Add principal point and camera distortion
+  // model and coefficients.  See also https://crbug.com/616098
+  struct CameraCalibration {
+    double focal_length_x = 0.0;
+    double focal_length_y = 0.0;
+    // depth near and far are used only for depth cameras.
+    double depth_near = 0.0;
+    double depth_far = 0.0;
+  };
+
+  base::Optional<CameraCalibration> camera_calibration;
 };
 
 using VideoCaptureDeviceDescriptors = std::vector<VideoCaptureDeviceDescriptor>;